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What’s the difference between the clear (DF2) and the white Dennison fasteners (DF1)?

The white fasteners are made of nylon and have a high heat resistance. They will not melt when used in hot head applications. The clear fasteners are constructed of polypropylene; they are not as strong but tend to break easily in order to take off tags. The clear fasteners are not heat resistant and do have a tendency of melting when used in conjunction with hot head presses.